[Qgis-user] Find / checkout different branches Github

[APM]

Dear List,


my questions are more related to the git system, but I hope you'll give 
me some information.


I like to compile QGIS on my own following

https://github.com/qgis/QGIS/blob/master/INSTALL.md#36-check-out-the-qgis-source-code

But I like to compile Qgis 3.20 and not the developement version.


My questions:


How to find the avaible versions ("branches"?) by using a 'git'-command ?

How to checkout a special version?


Further, what is the difference between "backport-43897-to-release-3_20"

and "backport-44030-to-release-3_20"?


Futher, I red that there's a version 3.20.1, but I can't find it?

Is this the 'master' branch?


Thank you very much!


Kind regards


Piet